The men pleaded guilty to driving their four-wheel-drive trucks off a closed road in the Poor Valley area of Tazewell County, spinning through a mudhole and up a creekbed.

Mud-bogging, a form of recreation among some four-wheelers, becomes a federal crime when they go cross-country in the George Washington and Jefferson National Forests.

Dozens of people have been charged so far this year, and the Forest Service was forced to close two roads after finding more than $30,000 in damage to the environment.

As part of plea agreements reached this week in U.S. District Court in Abingdon, each of the five men was fined $135 for driving off-road in April. They were ordered to collectively pay $3,200 to help restore the area.

"This is just another example of people disregarding the rules and tearing up barricades designed to prevent access to an area just so they can have a good time," forest service Capt. Woody Lipps said in a statement. "A few hours of fun in a truck can cause months or years worth of damage to the forest."